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Childhood obesity results from poor eating habits. It is also caused when someones parents are obese. Fast food restaurants and junk food are popular with children. In lieu of home cooking, it has become common for parents to take their children out to eat. Even when it is not a fast food restaurant, frequent eating out often results in weight gain.[3]

Often, a child whose parents are overweight or obese will also be overweight or obese. Although this is often caused by shared unhealthy eating habits in the household, it has been suggested that there may be a genetic (inherited) predisposition towards being, although this is as yet unproven and research is ongoing. Many children become slightly overweight because of their body's growth pattern. Some pediatricians may still classify this as childhood obesity.[citations needed]

Recent studies have shown that while there is evidence of in vitro influences on food choice, perhaps the largest influence can occur during the toddler years.[6] Indeed, recent studies have shown that parents influence an estimated 72% of what and how much their children eat on a daily basis. [7]

Conditions such as hypothyroidism, Cushing's syndrome, depression and certain neurological problems can lead to obesity or a tendency to gain weight in a child. Also, drugs such as steroids and some antidepressants may lead to obesity or a tendency to gain weight in a child.

Obese children often suffer from teasing amongst their peers.[11][12] Some are even harassed or discriminated against by their own family.[13]Stereotypes abound and may lead to low self esteem and depression.[14]

A study of 1800 children aged 2 to 12 in Colac, Australia tested a program of restricted diet (no carbonated drinks or sweets) and increased exercise. Interim results included a 68% increase in after school activity programs, 21% reduction in television viewing, and an average of 1 kg weight reduction compared to a control group.[15]

A survey carried out by the American Obesity Association into parental attitudes towards their children's weight showed the majority of parents think that recess should not be reduced or replaced. Almost 30% said that they were concerned with their child's weight. 35% of parents thought that their child's school was not teaching them enough about childhood obesity, and over 5% thought that childhood obesity was the greatest risk to their child's long term health.[16]
Although obesity is more common in girls [17] it is much more noticeable in boys, so that is why it is assumed that there are more overweight boys than girls. This is because fat deposits are located in far less areas of the exterior of the male body then the female, therefore it becomes larger in a much shorter period of time, in a limited number of places. The main places where boys become fat is the stomach (the fattest area), the back, and the chest. This is why boys can develop a belly roll (stomach hangs over pants) very quickly, or large amounts of back fat, and even breasts. Also it is important to note that this swelling of the stomach is also due to the fact that boys tend to have larger appetites than girls and therefore when they become fat, they are fatter then the typical overweight girl.[How to reference and link to summary or text]

A Northwestern University study indicates that inadequate sleep has a negative impact on a child's performance in school, their emotional and social welfare, and increases their risk of being overweight. This study was the first nationally represented, longitudinal investigation of the correlation between sleep, Body Mass Index (BMI) and overweight status in children between the ages of 3 and 18. The study found that an extra hour of sleep lowered the children's risk of being overweight from 36% to 30%, while it lessened older children's risk from 34% to 30%. [18]